initial version

Dockerfile

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+FROM debian:bookworm-slim
+
+RUN set -eux; \
+    apt-get update; \
+    DEBIAN_FRONTEND=noninteractive apt-get upgrade -y; \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        openssh-server \
+        curl \
+        telnet \
+        net-tools \
+        screen \
+    ; \
+    rm -rf /var/lib/apt/lists/*
+
+ADD start.sh /
+
+EXPOSE 22/tcp
+
+CMD /start.sh
+
+HEALTHCHECK CMD netstat -tnlp | grep '0.0.0.0:22' || exit 1

README.md

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+# Jumpbox Docker container
+
+* Debian slim based image
+* OpenSSH server
+
+# Supported tags and respective `Dockerfile` links
+
+-	[`latest`](https://git.nethuis.nl/pommi/docker-jumpbox/Dockerfile)
+
+# Usage
+
+```
+$ docker run -it \
+    --name jumpbox \
+    -v $(pwd)/authorized_keys:/root/.ssh/authorized_keys \
+    -p 1022:22 \
+    pommib/jumpbox:latest
+```
+
+# docker-compose
+
+```
+version: "3"
+
+services:
+  jumpbox:
+    container_name: jumpbox
+    image: pommib/jumpbox:latest
+    ports:
+      - "1022:22/tcp"
+    volumes:
+      - '${PWD}/authorized_keys:/root/.ssh/authorized_keys'
+```

build.sh

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+#!/bin/sh
+
+set -x
+
+IMAGE=pommib/jumpbox:latest
+docker pull $IMAGE
+docker pull debian:bookworm-slim
+docker build --no-cache -t $IMAGE ./
+docker push $IMAGE

rebuild.sh

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+#!/bin/sh
+
+updates_available () {
+    docker pull $1
+    if test "$(docker run -it --rm $1 /bin/sh -c 'apt -qqq update && apt -qq list --upgradable')" != ""; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+if updates_available pommib/jumpbox:latest; then
+    ./build.sh
+fi

start.sh

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+#!/bin/sh
+
+mkdir -p /run/sshd
+
+chown root: /root/.ssh/authorized_keys
+
+exec /usr/sbin/sshd -D -e